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- Committer: Teddy Hogeborn
- Date: 2009-05-17 00:50:09 UTC
- Revision ID: teddy@fukt.bsnet.se-20090517005009-c0iptxampo6nf177
* initramfs-tools-hook-conf: Security bug fix: Add code to handle
being called by "mkinitramfs-kpkg"
instead of "update-initramfs".
being called by "mkinitramfs-kpkg"
instead of "update-initramfs".
- files removed:
- DBUS-API
- debian/source
- network-hooks.d
- files modified:
- .bzrignore
added
removed
plugin-runner.c
1
/* -*- coding: utf-8; mode: c; mode: orgtbl -*- */
1
/* -*- coding: utf-8 -*- */
2
2
/*
3
3
* Mandos plugin runner - Run Mandos plugins
4
4
*
5
* Copyright © 2008-2013 Teddy Hogeborn
6
* Copyright © 2008-2013 Björn Påhlsson
5
* Copyright © 2008,2009 Teddy Hogeborn
6
* Copyright © 2008,2009 Björn Påhlsson
7
7
*
8
8
* This program is free software: you can redistribute it and/or
9
9
* modify it under the terms of the GNU General Public License as
19
19
* along with this program. If not, see
20
20
* <http://www.gnu.org/licenses/>.
21
21
*
22
* Contact the authors at <mandos@recompile.se>.
22
* Contact the authors at <mandos@fukt.bsnet.se>.
23
23
*/
24
24
25
25
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), getline(),
26
asprintf(), O_CLOEXEC */
26
asprintf() */
27
27
#include <stddef.h> /* size_t, NULL */
28
#include <stdlib.h> /* malloc(), exit(), EXIT_SUCCESS,
29
realloc() */
28
#include <stdlib.h> /* malloc(), exit(), EXIT_FAILURE,
29
EXIT_SUCCESS, realloc() */
30
30
#include <stdbool.h> /* bool, true, false */
31
#include <stdio.h> /* fileno(), fprintf(),
31
#include <stdio.h> /* perror, fileno(), fprintf(),
32
32
stderr, STDOUT_FILENO */
33
#include <sys/types.h> /* DIR, fdopendir(), stat(), struct
33
#include <sys/types.h> /* DIR, opendir(), stat(), struct
34
34
stat, waitpid(), WIFEXITED(),
35
35
WEXITSTATUS(), wait(), pid_t,
36
36
uid_t, gid_t, getuid(), getgid(),
38
38
#include <sys/select.h> /* fd_set, select(), FD_ZERO(),
39
39
FD_SET(), FD_ISSET(), FD_CLR */
40
40
#include <sys/wait.h> /* wait(), waitpid(), WIFEXITED(),
41
WEXITSTATUS(), WTERMSIG(),
42
WCOREDUMP() */
41
WEXITSTATUS() */
43
42
#include <sys/stat.h> /* struct stat, stat(), S_ISREG() */
44
43
#include <iso646.h> /* and, or, not */
45
#include <dirent.h> /* DIR, struct dirent, fdopendir(),
44
#include <dirent.h> /* DIR, struct dirent, opendir(),
46
45
readdir(), closedir(), dirfd() */
47
46
#include <unistd.h> /* struct stat, stat(), S_ISREG(),
48
47
fcntl(), setuid(), setgid(),
53
52
close() */
54
53
#include <fcntl.h> /* fcntl(), F_GETFD, F_SETFD,
55
54
FD_CLOEXEC */
56
#include <string.h> /* strsep, strlen(), asprintf(),
57
strsignal(), strcmp(), strncmp() */
55
#include <string.h> /* strsep, strlen(), asprintf() */
58
56
#include <errno.h> /* errno */
59
57
#include <argp.h> /* struct argp_option, struct
60
58
argp_state, struct argp,
68
66
*/
69
67
#include <errno.h> /* errno, EBADF */
70
68
#include <inttypes.h> /* intmax_t, PRIdMAX, strtoimax() */
71
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_IOERR,
72
EX_CONFIG, EX_UNAVAILABLE, EX_OK */
73
#include <errno.h> /* errno */
74
#include <error.h> /* error() */
75
69
76
70
#define BUFFER_SIZE 256
77
71
79
73
#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
80
74
81
75
const char *argp_program_version = "plugin-runner " VERSION;
82
const char *argp_program_bug_address = "<mandos@recompile.se>";
76
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
83
77
84
78
typedef struct plugin{
85
79
char *name; /* can be NULL or any plugin name */
105
99
106
100
/* Gets an existing plugin based on name,
107
101
or if none is found, creates a new one */
108
__attribute__((warn_unused_result))
109
102
static plugin *getplugin(char *name){
110
/* Check for existing plugin with that name */
103
/* Check for exiting plugin with that name */
111
104
for(plugin *p = plugin_list; p != NULL; p = p->next){
112
105
if((p->name == name)
113
106
or (p->name and name and (strcmp(p->name, name) == 0))){
115
108
}
116
109
}
117
110
/* Create a new plugin */
118
plugin *new_plugin = NULL;
119
do {
120
new_plugin = malloc(sizeof(plugin));
121
} while(new_plugin == NULL and errno == EINTR);
111
plugin *new_plugin = malloc(sizeof(plugin));
122
112
if(new_plugin == NULL){
123
113
return NULL;
124
114
}
125
115
char *copy_name = NULL;
126
116
if(name != NULL){
127
do {
128
copy_name = strdup(name);
129
} while(copy_name == NULL and errno == EINTR);
117
copy_name = strdup(name);
130
118
if(copy_name == NULL){
131
int e = errno;
132
119
free(new_plugin);
133
errno = e;
134
120
return NULL;
135
121
}
136
122
}
140
126
.disabled = false,
141
127
.next = plugin_list };
142
128
143
do {
144
new_plugin->argv = malloc(sizeof(char *) * 2);
145
} while(new_plugin->argv == NULL and errno == EINTR);
129
new_plugin->argv = malloc(sizeof(char *) * 2);
146
130
if(new_plugin->argv == NULL){
147
int e = errno;
148
131
free(copy_name);
149
132
free(new_plugin);
150
errno = e;
151
133
return NULL;
152
134
}
153
135
new_plugin->argv[0] = copy_name;
154
136
new_plugin->argv[1] = NULL;
155
137
156
do {
157
new_plugin->environ = malloc(sizeof(char *));
158
} while(new_plugin->environ == NULL and errno == EINTR);
138
new_plugin->environ = malloc(sizeof(char *));
159
139
if(new_plugin->environ == NULL){
160
int e = errno;
161
140
free(copy_name);
162
141
free(new_plugin->argv);
163
142
free(new_plugin);
164
errno = e;
165
143
return NULL;
166
144
}
167
145
new_plugin->environ[0] = NULL;
172
150
}
173
151
174
152
/* Helper function for add_argument and add_environment */
175
__attribute__((nonnull, warn_unused_result))
176
153
static bool add_to_char_array(const char *new, char ***array,
177
154
int *len){
178
155
/* Resize the pointed-to array to hold one more pointer */
179
char **new_array = NULL;
180
do {
181
new_array = realloc(*array, sizeof(char *)
182
* (size_t) ((*len) + 2));
183
} while(new_array == NULL and errno == EINTR);
156
*array = realloc(*array, sizeof(char *)
157
* (size_t) ((*len) + 2));
184
158
/* Malloc check */
185
if(new_array == NULL){
159
if(*array == NULL){
186
160
return false;
187
161
}
188
*array = new_array;
189
162
/* Make a copy of the new string */
190
char *copy;
191
do {
192
copy = strdup(new);
193
} while(copy == NULL and errno == EINTR);
163
char *copy = strdup(new);
194
164
if(copy == NULL){
195
165
return false;
196
166
}
203
173
}
204
174
205
175
/* Add to a plugin's argument vector */
206
__attribute__((nonnull(2), warn_unused_result))
207
176
static bool add_argument(plugin *p, const char *arg){
208
177
if(p == NULL){
209
178
return false;
212
181
}
213
182
214
183
/* Add to a plugin's environment */
215
__attribute__((nonnull(2), warn_unused_result))
216
184
static bool add_environment(plugin *p, const char *def, bool replace){
217
185
if(p == NULL){
218
186
return false;
220
188
/* namelen = length of name of environment variable */
221
189
size_t namelen = (size_t)(strchrnul(def, '=') - def);
222
190
/* Search for this environment variable */
223
for(char **envdef = p->environ; *envdef != NULL; envdef++){
224
if(strncmp(*envdef, def, namelen + 1) == 0){
191
for(char **e = p->environ; *e != NULL; e++){
192
if(strncmp(*e, def, namelen + 1) == 0){
225
193
/* It already exists */
226
194
if(replace){
227
char *new_envdef;
228
do {
229
new_envdef = realloc(*envdef, strlen(def) + 1);
230
} while(new_envdef == NULL and errno == EINTR);
231
if(new_envdef == NULL){
195
char *new = realloc(*e, strlen(def) + 1);
196
if(new == NULL){
232
197
return false;
233
198
}
234
*envdef = new_envdef;
235
strcpy(*envdef, def);
199
*e = new;
200
strcpy(*e, def);
236
201
}
237
202
return true;
238
203
}
243
208
/*
244
209
* Based on the example in the GNU LibC manual chapter 13.13 "File
245
210
* Descriptor Flags".
246
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
211
* *Note File Descriptor Flags:(libc)Descriptor Flags.
247
212
*/
248
__attribute__((warn_unused_result))
249
213
static int set_cloexec_flag(int fd){
250
int ret = (int)TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));
214
int ret = fcntl(fd, F_GETFD, 0);
251
215
/* If reading the flags failed, return error indication now. */
252
216
if(ret < 0){
253
217
return ret;
254
218
}
255
219
/* Store modified flag word in the descriptor. */
256
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
257
ret | FD_CLOEXEC));
220
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
258
221
}
259
222
260
223
275
238
/* No child processes */
276
239
break;
277
240
}
278
error(0, errno, "waitpid");
241
perror("waitpid");
279
242
}
280
243
281
244
/* A child exited, find it in process_list */
293
256
}
294
257
295
258
/* Prints out a password to stdout */
296
__attribute__((nonnull, warn_unused_result))
297
259
static bool print_out_password(const char *buffer, size_t length){
298
260
ssize_t ret;
299
261
for(size_t written = 0; written < length; written += (size_t)ret){
307
269
}
308
270
309
271
/* Removes and free a plugin from the plugin list */
310
__attribute__((nonnull))
311
272
static void free_plugin(plugin *plugin_node){
312
273
313
274
for(char **arg = plugin_node->argv; *arg != NULL; arg++){
354
315
fd_set rfds_all;
355
316
int ret, maxfd = 0;
356
317
ssize_t sret;
318
intmax_t tmpmax;
357
319
uid_t uid = 65534;
358
320
gid_t gid = 65534;
359
321
bool debug = false;
368
330
sigemptyset(&sigchld_action.sa_mask);
369
331
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
370
332
if(ret == -1){
371
error(0, errno, "sigaddset");
372
exitstatus = EX_OSERR;
333
perror("sigaddset");
334
exitstatus = EXIT_FAILURE;
373
335
goto fallback;
374
336
}
375
337
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
376
338
if(ret == -1){
377
error(0, errno, "sigaction");
378
exitstatus = EX_OSERR;
339
perror("sigaction");
340
exitstatus = EXIT_FAILURE;
379
341
goto fallback;
380
342
}
381
343
413
375
.doc = "Group ID the plugins will run as", .group = 3 },
414
376
{ .name = "debug", .key = 132,
415
377
.doc = "Debug mode", .group = 4 },
416
/*
417
* These reproduce what we would get without ARGP_NO_HELP
418
*/
419
{ .name = "help", .key = '?',
420
.doc = "Give this help list", .group = -1 },
421
{ .name = "usage", .key = -3,
422
.doc = "Give a short usage message", .group = -1 },
423
{ .name = "version", .key = 'V',
424
.doc = "Print program version", .group = -1 },
425
378
{ .name = NULL }
426
379
};
427
380
428
__attribute__((nonnull(3)))
429
error_t parse_opt(int key, char *arg, struct argp_state *state){
430
errno = 0;
381
error_t parse_opt(int key, char *arg, __attribute__((unused))
382
struct argp_state *state){
383
char *tmp;
431
384
switch(key){
432
char *tmp;
433
intmax_t tmp_id;
434
385
case 'g': /* --global-options */
435
{
386
if(arg != NULL){
436
387
char *plugin_option;
437
388
while((plugin_option = strsep(&arg, ",")) != NULL){
389
if(plugin_option[0] == '\0'){
390
continue;
391
}
438
392
if(not add_argument(getplugin(NULL), plugin_option)){
439
break;
393
perror("add_argument");
394
return ARGP_ERR_UNKNOWN;
440
395
}
441
396
}
442
errno = 0;
443
397
}
444
398
break;
445
399
case 'G': /* --global-env */
446
if(add_environment(getplugin(NULL), arg, true)){
447
errno = 0;
400
if(arg == NULL){
401
break;
402
}
403
if(not add_environment(getplugin(NULL), arg, true)){
404
perror("add_environment");
448
405
}
449
406
break;
450
407
case 'o': /* --options-for */
451
{
452
char *option_list = strchr(arg, ':');
453
if(option_list == NULL){
454
argp_error(state, "No colon in \"%s\"", arg);
455
errno = EINVAL;
456
break;
457
}
458
*option_list = '\0';
459
option_list++;
460
if(arg[0] == '\0'){
461
argp_error(state, "Empty plugin name");
462
errno = EINVAL;
463
break;
464
}
465
char *option;
466
while((option = strsep(&option_list, ",")) != NULL){
467
if(not add_argument(getplugin(arg), option)){
468
break;
408
if(arg != NULL){
409
char *plugin_name = strsep(&arg, ":");
410
if(plugin_name[0] == '\0'){
411
break;
412
}
413
char *plugin_option;
414
while((plugin_option = strsep(&arg, ",")) != NULL){
415
if(not add_argument(getplugin(plugin_name), plugin_option)){
416
perror("add_argument");
417
return ARGP_ERR_UNKNOWN;
469
418
}
470
419
}
471
errno = 0;
472
420
}
473
421
break;
474
422
case 'E': /* --env-for */
423
if(arg == NULL){
424
break;
425
}
475
426
{
476
427
char *envdef = strchr(arg, ':');
477
428
if(envdef == NULL){
478
argp_error(state, "No colon in \"%s\"", arg);
479
errno = EINVAL;
480
429
break;
481
430
}
482
431
*envdef = '\0';
483
envdef++;
484
if(arg[0] == '\0'){
485
argp_error(state, "Empty plugin name");
486
errno = EINVAL;
487
break;
488
}
489
if(add_environment(getplugin(arg), envdef, true)){
490
errno = 0;
432
if(not add_environment(getplugin(arg), envdef+1, true)){
433
perror("add_environment");
491
434
}
492
435
}
493
436
break;
494
437
case 'd': /* --disable */
495
{
438
if(arg != NULL){
496
439
plugin *p = getplugin(arg);
497
if(p != NULL){
498
p->disabled = true;
499
errno = 0;
440
if(p == NULL){
441
return ARGP_ERR_UNKNOWN;
500
442
}
443
p->disabled = true;
501
444
}
502
445
break;
503
446
case 'e': /* --enable */
504
{
447
if(arg != NULL){
505
448
plugin *p = getplugin(arg);
506
if(p != NULL){
507
p->disabled = false;
508
errno = 0;
449
if(p == NULL){
450
return ARGP_ERR_UNKNOWN;
509
451
}
452
p->disabled = false;
510
453
}
511
454
break;
512
455
case 128: /* --plugin-dir */
513
456
free(plugindir);
514
457
plugindir = strdup(arg);
515
if(plugindir != NULL){
516
errno = 0;
517
}
458
if(plugindir == NULL){
459
perror("strdup");
460
}
518
461
break;
519
462
case 129: /* --config-file */
520
463
/* This is already done by parse_opt_config_file() */
521
464
break;
522
465
case 130: /* --userid */
523
tmp_id = strtoimax(arg, &tmp, 10);
466
errno = 0;
467
tmpmax = strtoimax(arg, &tmp, 10);
524
468
if(errno != 0 or tmp == arg or *tmp != '\0'
525
or tmp_id != (uid_t)tmp_id){
526
argp_error(state, "Bad user ID number: \"%s\", using %"
527
PRIdMAX, arg, (intmax_t)uid);
528
break;
469
or tmpmax != (uid_t)tmpmax){
470
fprintf(stderr, "Bad user ID number: \"%s\", using %"
471
PRIdMAX "\n", arg, (intmax_t)uid);
472
} else {
473
uid = (uid_t)tmpmax;
529
474
}
530
uid = (uid_t)tmp_id;
531
errno = 0;
532
475
break;
533
476
case 131: /* --groupid */
534
tmp_id = strtoimax(arg, &tmp, 10);
477
errno = 0;
478
tmpmax = strtoimax(arg, &tmp, 10);
535
479
if(errno != 0 or tmp == arg or *tmp != '\0'
536
or tmp_id != (gid_t)tmp_id){
537
argp_error(state, "Bad group ID number: \"%s\", using %"
538
PRIdMAX, arg, (intmax_t)gid);
539
break;
480
or tmpmax != (gid_t)tmpmax){
481
fprintf(stderr, "Bad group ID number: \"%s\", using %"
482
PRIdMAX "\n", arg, (intmax_t)gid);
483
} else {
484
gid = (gid_t)tmpmax;
540
485
}
541
gid = (gid_t)tmp_id;
542
errno = 0;
543
486
break;
544
487
case 132: /* --debug */
545
488
debug = true;
546
489
break;
547
/*
548
* These reproduce what we would get without ARGP_NO_HELP
549
*/
550
case '?': /* --help */
551
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
552
argp_state_help(state, state->out_stream, ARGP_HELP_STD_HELP);
553
case -3: /* --usage */
554
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
555
argp_state_help(state, state->out_stream,
556
ARGP_HELP_USAGE | ARGP_HELP_EXIT_OK);
557
case 'V': /* --version */
558
fprintf(state->out_stream, "%s\n", argp_program_version);
559
exit(EXIT_SUCCESS);
560
break;
561
490
/*
562
491
* When adding more options before this line, remember to also add a
563
492
* "case" to the "parse_opt_config_file" function below.
566
495
/* Cryptsetup always passes an argument, which is an empty
567
496
string if "none" was specified in /etc/crypttab. So if
568
497
argument was empty, we ignore it silently. */
569
if(arg[0] == '\0'){
570
break;
498
if(arg[0] != '\0'){
499
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
571
500
}
501
break;
502
case ARGP_KEY_END:
503
break;
572
504
default:
573
505
return ARGP_ERR_UNKNOWN;
574
506
}
575
return errno; /* Set to 0 at start */
507
return 0;
576
508
}
577
509
578
510
/* This option parser is the same as parse_opt() above, except it
580
512
error_t parse_opt_config_file(int key, char *arg,
581
513
__attribute__((unused))
582
514
struct argp_state *state){
583
errno = 0;
584
515
switch(key){
585
516
case 'g': /* --global-options */
586
517
case 'G': /* --global-env */
593
524
case 129: /* --config-file */
594
525
free(argfile);
595
526
argfile = strdup(arg);
596
if(argfile != NULL){
597
errno = 0;
527
if(argfile == NULL){
528
perror("strdup");
598
529
}
599
break;
530
break;
600
531
case 130: /* --userid */
601
532
case 131: /* --groupid */
602
533
case 132: /* --debug */
603
case '?': /* --help */
604
case -3: /* --usage */
605
case 'V': /* --version */
606
534
case ARGP_KEY_ARG:
535
case ARGP_KEY_END:
607
536
break;
608
537
default:
609
538
return ARGP_ERR_UNKNOWN;
610
539
}
611
return errno;
540
return 0;
612
541
}
613
542
614
543
struct argp argp = { .options = options,
618
547
619
548
/* Parse using parse_opt_config_file() in order to get the custom
620
549
config file location, if any. */
621
ret = argp_parse(&argp, argc, argv,
622
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
623
NULL, NULL);
624
switch(ret){
625
case 0:
626
break;
627
case ENOMEM:
628
default:
629
errno = ret;
630
error(0, errno, "argp_parse");
631
exitstatus = EX_OSERR;
632
goto fallback;
633
case EINVAL:
634
exitstatus = EX_USAGE;
550
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
551
if(ret == ARGP_ERR_UNKNOWN){
552
fprintf(stderr, "Unknown error while parsing arguments\n");
553
exitstatus = EXIT_FAILURE;
635
554
goto fallback;
636
555
}
637
556
643
562
conffp = fopen(AFILE, "r");
644
563
} else {
645
564
conffp = fopen(argfile, "r");
646
}
565
}
647
566
if(conffp != NULL){
648
567
char *org_line = NULL;
649
568
char *p, *arg, *new_arg, *line;
654
573
custom_argc = 1;
655
574
custom_argv = malloc(sizeof(char*) * 2);
656
575
if(custom_argv == NULL){
657
error(0, errno, "malloc");
658
exitstatus = EX_OSERR;
576
perror("malloc");
577
exitstatus = EXIT_FAILURE;
659
578
goto fallback;
660
579
}
661
580
custom_argv[0] = argv[0];
677
596
}
678
597
new_arg = strdup(p);
679
598
if(new_arg == NULL){
680
error(0, errno, "strdup");
681
exitstatus = EX_OSERR;
599
perror("strdup");
600
exitstatus = EXIT_FAILURE;
682
601
free(org_line);
683
602
goto fallback;
684
603
}
685
604
686
605
custom_argc += 1;
687
{
688
char **new_argv = realloc(custom_argv, sizeof(char *)
689
* ((unsigned int)
690
custom_argc + 1));
691
if(new_argv == NULL){
692
error(0, errno, "realloc");
693
exitstatus = EX_OSERR;
694
free(new_arg);
695
free(org_line);
696
goto fallback;
697
} else {
698
custom_argv = new_argv;
699
}
606
custom_argv = realloc(custom_argv, sizeof(char *)
607
* ((unsigned int) custom_argc + 1));
608
if(custom_argv == NULL){
609
perror("realloc");
610
exitstatus = EXIT_FAILURE;
611
free(org_line);
612
goto fallback;
700
613
}
701
614
custom_argv[custom_argc-1] = new_arg;
702
custom_argv[custom_argc] = NULL;
615
custom_argv[custom_argc] = NULL;
703
616
}
704
617
}
705
do {
706
ret = fclose(conffp);
707
} while(ret == EOF and errno == EINTR);
708
if(ret == EOF){
709
error(0, errno, "fclose");
710
exitstatus = EX_IOERR;
711
goto fallback;
712
}
713
618
free(org_line);
714
619
} else {
715
620
/* Check for harmful errors and go to fallback. Other errors might
716
621
not affect opening plugins */
717
622
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
718
error(0, errno, "fopen");
719
exitstatus = EX_OSERR;
623
perror("fopen");
624
exitstatus = EXIT_FAILURE;
720
625
goto fallback;
721
626
}
722
627
}
723
/* If there were any arguments from the configuration file, pass
724
them to parser as command line arguments */
628
/* If there was any arguments from configuration file,
629
pass them to parser as command arguments */
725
630
if(custom_argv != NULL){
726
ret = argp_parse(&argp, custom_argc, custom_argv,
727
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
728
NULL, NULL);
729
switch(ret){
730
case 0:
731
break;
732
case ENOMEM:
733
default:
734
errno = ret;
735
error(0, errno, "argp_parse");
736
exitstatus = EX_OSERR;
737
goto fallback;
738
case EINVAL:
739
exitstatus = EX_CONFIG;
631
ret = argp_parse(&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
632
0, NULL);
633
if(ret == ARGP_ERR_UNKNOWN){
634
fprintf(stderr, "Unknown error while parsing arguments\n");
635
exitstatus = EXIT_FAILURE;
740
636
goto fallback;
741
637
}
742
638
}
743
639
744
640
/* Parse actual command line arguments, to let them override the
745
641
config file */
746
ret = argp_parse(&argp, argc, argv,
747
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
748
NULL, NULL);
749
switch(ret){
750
case 0:
751
break;
752
case ENOMEM:
753
default:
754
errno = ret;
755
error(0, errno, "argp_parse");
756
exitstatus = EX_OSERR;
757
goto fallback;
758
case EINVAL:
759
exitstatus = EX_USAGE;
642
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
643
if(ret == ARGP_ERR_UNKNOWN){
644
fprintf(stderr, "Unknown error while parsing arguments\n");
645
exitstatus = EXIT_FAILURE;
760
646
goto fallback;
761
647
}
762
648
774
660
}
775
661
}
776
662
777
if(getuid() == 0){
778
/* Work around Debian bug #633582:
779
<http://bugs.debian.org/633582> */
780
int plugindir_fd = open(/* plugindir or */ PDIR, O_RDONLY);
781
if(plugindir_fd == -1){
782
error(0, errno, "open");
783
} else {
784
ret = (int)TEMP_FAILURE_RETRY(fstat(plugindir_fd, &st));
785
if(ret == -1){
786
error(0, errno, "fstat");
787
} else {
788
if(S_ISDIR(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
789
ret = fchown(plugindir_fd, uid, gid);
790
if(ret == -1){
791
error(0, errno, "fchown");
792
}
793
}
794
}
795
TEMP_FAILURE_RETRY(close(plugindir_fd));
796
}
797
}
798
799
/* Lower permissions */
800
ret = setgid(gid);
663
/* Strip permissions down to nobody */
664
setgid(gid);
801
665
if(ret == -1){
802
error(0, errno, "setgid");
666
perror("setgid");
803
667
}
804
668
ret = setuid(uid);
805
669
if(ret == -1){
806
error(0, errno, "setuid");
807
}
808
809
/* Open plugin directory with close_on_exec flag */
670
perror("setuid");
671
}
672
673
if(plugindir == NULL){
674
dir = opendir(PDIR);
675
} else {
676
dir = opendir(plugindir);
677
}
678
679
if(dir == NULL){
680
perror("Could not open plugin dir");
681
exitstatus = EXIT_FAILURE;
682
goto fallback;
683
}
684
685
/* Set the FD_CLOEXEC flag on the directory, if possible */
810
686
{
811
int dir_fd = -1;
812
if(plugindir == NULL){
813
dir_fd = open(PDIR, O_RDONLY |
814
#ifdef O_CLOEXEC
815
O_CLOEXEC
816
#else /* not O_CLOEXEC */
817
0
818
#endif /* not O_CLOEXEC */
819
);
820
} else {
821
dir_fd = open(plugindir, O_RDONLY |
822
#ifdef O_CLOEXEC
823
O_CLOEXEC
824
#else /* not O_CLOEXEC */
825
0
826
#endif /* not O_CLOEXEC */
827
);
828
}
829
if(dir_fd == -1){
830
error(0, errno, "Could not open plugin dir");
831
exitstatus = EX_UNAVAILABLE;
832
goto fallback;
833
}
834
835
#ifndef O_CLOEXEC
836
/* Set the FD_CLOEXEC flag on the directory */
837
ret = set_cloexec_flag(dir_fd);
838
if(ret < 0){
839
error(0, errno, "set_cloexec_flag");
840
TEMP_FAILURE_RETRY(close(dir_fd));
841
exitstatus = EX_OSERR;
842
goto fallback;
843
}
844
#endif /* O_CLOEXEC */
845
846
dir = fdopendir(dir_fd);
847
if(dir == NULL){
848
error(0, errno, "Could not open plugin dir");
849
TEMP_FAILURE_RETRY(close(dir_fd));
850
exitstatus = EX_OSERR;
851
goto fallback;
687
int dir_fd = dirfd(dir);
688
if(dir_fd >= 0){
689
ret = set_cloexec_flag(dir_fd);
690
if(ret < 0){
691
perror("set_cloexec_flag");
692
exitstatus = EXIT_FAILURE;
693
goto fallback;
694
}
852
695
}
853
696
}
854
697
856
699
857
700
/* Read and execute any executable in the plugin directory*/
858
701
while(true){
859
do {
860
dirst = readdir(dir);
861
} while(dirst == NULL and errno == EINTR);
702
dirst = readdir(dir);
862
703
863
704
/* All directory entries have been processed */
864
705
if(dirst == NULL){
865
706
if(errno == EBADF){
866
error(0, errno, "readdir");
867
exitstatus = EX_IOERR;
707
perror("readdir");
708
exitstatus = EXIT_FAILURE;
868
709
goto fallback;
869
710
}
870
711
break;
876
717
{
877
718
bool bad_name = false;
878
719
879
const char * const bad_prefixes[] = { ".", "#", NULL };
720
const char const *bad_prefixes[] = { ".", "#", NULL };
880
721
881
const char * const bad_suffixes[] = { "~", "#", ".dpkg-new",
722
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
882
723
".dpkg-old",
883
724
".dpkg-bak",
884
725
".dpkg-divert", NULL };
885
#ifdef __GNUC__
886
#pragma GCC diagnostic push
887
#pragma GCC diagnostic ignored "-Wcast-qual"
888
#endif
889
for(const char **pre = (const char **)bad_prefixes;
890
*pre != NULL; pre++){
891
#ifdef __GNUC__
892
#pragma GCC diagnostic pop
893
#endif
726
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
894
727
size_t pre_len = strlen(*pre);
895
728
if((d_name_len >= pre_len)
896
729
and strncmp((dirst->d_name), *pre, pre_len) == 0){
905
738
if(bad_name){
906
739
continue;
907
740
}
908
#ifdef __GNUC__
909
#pragma GCC diagnostic push
910
#pragma GCC diagnostic ignored "-Wcast-qual"
911
#endif
912
for(const char **suf = (const char **)bad_suffixes;
913
*suf != NULL; suf++){
914
#ifdef __GNUC__
915
#pragma GCC diagnostic pop
916
#endif
741
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
917
742
size_t suf_len = strlen(*suf);
918
743
if((d_name_len >= suf_len)
919
and (strcmp((dirst->d_name) + d_name_len-suf_len, *suf)
744
and (strcmp((dirst->d_name)+d_name_len-suf_len, *suf)
920
745
== 0)){
921
746
if(debug){
922
747
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
934
759
935
760
char *filename;
936
761
if(plugindir == NULL){
937
ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, PDIR "/%s",
938
dirst->d_name));
762
ret = asprintf(&filename, PDIR "/%s", dirst->d_name);
939
763
} else {
940
ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, "%s/%s",
941
plugindir,
942
dirst->d_name));
764
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
943
765
}
944
766
if(ret < 0){
945
error(0, errno, "asprintf");
767
perror("asprintf");
946
768
continue;
947
769
}
948
770
949
ret = (int)TEMP_FAILURE_RETRY(stat(filename, &st));
771
ret = stat(filename, &st);
950
772
if(ret == -1){
951
error(0, errno, "stat");
773
perror("stat");
952
774
free(filename);
953
775
continue;
954
776
}
955
777
956
778
/* Ignore non-executable files */
957
if(not S_ISREG(st.st_mode)
958
or (TEMP_FAILURE_RETRY(access(filename, X_OK)) != 0)){
779
if(not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
959
780
if(debug){
960
781
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
961
782
" with bad type or mode\n", filename);
966
787
967
788
plugin *p = getplugin(dirst->d_name);
968
789
if(p == NULL){
969
error(0, errno, "getplugin");
790
perror("getplugin");
970
791
free(filename);
971
792
continue;
972
793
}
984
805
if(g != NULL){
985
806
for(char **a = g->argv + 1; *a != NULL; a++){
986
807
if(not add_argument(p, *a)){
987
error(0, errno, "add_argument");
808
perror("add_argument");
988
809
}
989
810
}
990
811
/* Add global environment variables */
991
812
for(char **e = g->environ; *e != NULL; e++){
992
813
if(not add_environment(p, *e, false)){
993
error(0, errno, "add_environment");
814
perror("add_environment");
994
815
}
995
816
}
996
817
}
1001
822
if(p->environ[0] != NULL){
1002
823
for(char **e = environ; *e != NULL; e++){
1003
824
if(not add_environment(p, *e, false)){
1004
error(0, errno, "add_environment");
825
perror("add_environment");
1005
826
}
1006
827
}
1007
828
}
1008
829
1009
830
int pipefd[2];
1010
ret = (int)TEMP_FAILURE_RETRY(pipe(pipefd));
831
ret = pipe(pipefd);
1011
832
if(ret == -1){
1012
error(0, errno, "pipe");
1013
exitstatus = EX_OSERR;
833
perror("pipe");
834
exitstatus = EXIT_FAILURE;
1014
835
goto fallback;
1015
836
}
1016
837
/* Ask OS to automatic close the pipe on exec */
1017
838
ret = set_cloexec_flag(pipefd[0]);
1018
839
if(ret < 0){
1019
error(0, errno, "set_cloexec_flag");
1020
exitstatus = EX_OSERR;
840
perror("set_cloexec_flag");
841
exitstatus = EXIT_FAILURE;
1021
842
goto fallback;
1022
843
}
1023
844
ret = set_cloexec_flag(pipefd[1]);
1024
845
if(ret < 0){
1025
error(0, errno, "set_cloexec_flag");
1026
exitstatus = EX_OSERR;
846
perror("set_cloexec_flag");
847
exitstatus = EXIT_FAILURE;
1027
848
goto fallback;
1028
849
}
1029
850
/* Block SIGCHLD until process is safely in process list */
1030
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
1031
&sigchld_action.sa_mask,
1032
NULL));
851
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1033
852
if(ret < 0){
1034
error(0, errno, "sigprocmask");
1035
exitstatus = EX_OSERR;
853
perror("sigprocmask");
854
exitstatus = EXIT_FAILURE;
1036
855
goto fallback;
1037
856
}
1038
857
/* Starting a new process to be watched */
1039
pid_t pid;
1040
do {
1041
pid = fork();
1042
} while(pid == -1 and errno == EINTR);
858
pid_t pid = fork();
1043
859
if(pid == -1){
1044
error(0, errno, "fork");
1045
exitstatus = EX_OSERR;
860
perror("fork");
861
exitstatus = EXIT_FAILURE;
1046
862
goto fallback;
1047
863
}
1048
864
if(pid == 0){
1049
865
/* this is the child process */
1050
866
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1051
867
if(ret < 0){
1052
error(0, errno, "sigaction");
1053
_exit(EX_OSERR);
868
perror("sigaction");
869
_exit(EXIT_FAILURE);
1054
870
}
1055
871
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1056
872
if(ret < 0){
1057
error(0, errno, "sigprocmask");
1058
_exit(EX_OSERR);
873
perror("sigprocmask");
874
_exit(EXIT_FAILURE);
1059
875
}
1060
876
1061
877
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
1062
878
if(ret == -1){
1063
error(0, errno, "dup2");
1064
_exit(EX_OSERR);
879
perror("dup2");
880
_exit(EXIT_FAILURE);
1065
881
}
1066
882
1067
883
if(dirfd(dir) < 0){
1071
887
}
1072
888
if(p->environ[0] == NULL){
1073
889
if(execv(filename, p->argv) < 0){
1074
error(0, errno, "execv for %s", filename);
1075
_exit(EX_OSERR);
890
perror("execv");
891
_exit(EXIT_FAILURE);
1076
892
}
1077
893
} else {
1078
894
if(execve(filename, p->argv, p->environ) < 0){
1079
error(0, errno, "execve for %s", filename);
1080
_exit(EX_OSERR);
895
perror("execve");
896
_exit(EXIT_FAILURE);
1081
897
}
1082
898
}
1083
899
/* no return */
1084
900
}
1085
901
/* Parent process */
1086
TEMP_FAILURE_RETRY(close(pipefd[1])); /* Close unused write end of
1087
pipe */
902
close(pipefd[1]); /* Close unused write end of pipe */
1088
903
free(filename);
1089
904
plugin *new_plugin = getplugin(dirst->d_name);
1090
905
if(new_plugin == NULL){
1091
error(0, errno, "getplugin");
1092
ret = (int)(TEMP_FAILURE_RETRY
1093
(sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1094
NULL)));
906
perror("getplugin");
907
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1095
908
if(ret < 0){
1096
error(0, errno, "sigprocmask");
909
perror("sigprocmask");
1097
910
}
1098
exitstatus = EX_OSERR;
911
exitstatus = EXIT_FAILURE;
1099
912
goto fallback;
1100
913
}
1101
914
1104
917
1105
918
/* Unblock SIGCHLD so signal handler can be run if this process
1106
919
has already completed */
1107
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1108
&sigchld_action.sa_mask,
1109
NULL));
920
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1110
921
if(ret < 0){
1111
error(0, errno, "sigprocmask");
1112
exitstatus = EX_OSERR;
922
perror("sigprocmask");
923
exitstatus = EXIT_FAILURE;
1113
924
goto fallback;
1114
925
}
1115
926
1116
#if defined (__GNUC__) and defined (__GLIBC__)
1117
#if not __GLIBC_PREREQ(2, 16)
1118
#pragma GCC diagnostic push
1119
#pragma GCC diagnostic ignored "-Wsign-conversion"
1120
#endif
1121
#endif
1122
FD_SET(new_plugin->fd, &rfds_all); /* Spurious warning from
1123
-Wconversion in GNU libc
1124
before 2.16 */
1125
#if defined (__GNUC__) and defined (__GLIBC__)
1126
#if not __GLIBC_PREREQ(2, 16)
1127
#pragma GCC diagnostic pop
1128
#endif
1129
#endif
927
FD_SET(new_plugin->fd, &rfds_all);
1130
928
1131
929
if(maxfd < new_plugin->fd){
1132
930
maxfd = new_plugin->fd;
1133
931
}
1134
932
}
1135
933
1136
TEMP_FAILURE_RETRY(closedir(dir));
934
closedir(dir);
1137
935
dir = NULL;
1138
936
free_plugin(getplugin(NULL));
1139
937
1152
950
while(plugin_list){
1153
951
fd_set rfds = rfds_all;
1154
952
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
1155
if(select_ret == -1 and errno != EINTR){
1156
error(0, errno, "select");
1157
exitstatus = EX_OSERR;
953
if(select_ret == -1){
954
perror("select");
955
exitstatus = EXIT_FAILURE;
1158
956
goto fallback;
1159
957
}
1160
958
/* OK, now either a process completed, or something can be read
1175
973
WEXITSTATUS(proc->status));
1176
974
} else if(WIFSIGNALED(proc->status)){
1177
975
fprintf(stderr, "Plugin %s [%" PRIdMAX "] killed by"
1178
" signal %d: %s\n", proc->name,
976
" signal %d\n", proc->name,
1179
977
(intmax_t) (proc->pid),
1180
WTERMSIG(proc->status),
1181
strsignal(WTERMSIG(proc->status)));
978
WTERMSIG(proc->status));
1182
979
} else if(WCOREDUMP(proc->status)){
1183
980
fprintf(stderr, "Plugin %s [%" PRIdMAX "] dumped"
1184
981
" core\n", proc->name, (intmax_t) (proc->pid));
1186
983
}
1187
984
1188
985
/* Remove the plugin */
1189
#if defined (__GNUC__) and defined (__GLIBC__)
1190
#if not __GLIBC_PREREQ(2, 16)
1191
#pragma GCC diagnostic push
1192
#pragma GCC diagnostic ignored "-Wsign-conversion"
1193
#endif
1194
#endif
1195
FD_CLR(proc->fd, &rfds_all); /* Spurious warning from
1196
-Wconversion in GNU libc
1197
before 2.16 */
1198
#if defined (__GNUC__) and defined (__GLIBC__)
1199
#if not __GLIBC_PREREQ(2, 16)
1200
#pragma GCC diagnostic pop
1201
#endif
1202
#endif
986
FD_CLR(proc->fd, &rfds_all);
1203
987
1204
988
/* Block signal while modifying process_list */
1205
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1206
(SIG_BLOCK,
1207
&sigchld_action.sa_mask,
1208
NULL));
989
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1209
990
if(ret < 0){
1210
error(0, errno, "sigprocmask");
1211
exitstatus = EX_OSERR;
991
perror("sigprocmask");
992
exitstatus = EXIT_FAILURE;
1212
993
goto fallback;
1213
994
}
1214
995
1217
998
proc = next_plugin;
1218
999
1219
1000
/* We are done modifying process list, so unblock signal */
1220
ret = (int)(TEMP_FAILURE_RETRY
1221
(sigprocmask(SIG_UNBLOCK,
1222
&sigchld_action.sa_mask, NULL)));
1001
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1002
NULL);
1223
1003
if(ret < 0){
1224
error(0, errno, "sigprocmask");
1225
exitstatus = EX_OSERR;
1004
perror("sigprocmask");
1005
exitstatus = EXIT_FAILURE;
1226
1006
goto fallback;
1227
1007
}
1228
1008
1238
1018
bool bret = print_out_password(proc->buffer,
1239
1019
proc->buffer_length);
1240
1020
if(not bret){
1241
error(0, errno, "print_out_password");
1242
exitstatus = EX_IOERR;
1021
perror("print_out_password");
1022
exitstatus = EXIT_FAILURE;
1243
1023
}
1244
1024
goto fallback;
1245
1025
}
1246
1026
1247
1027
/* This process has not completed. Does it have any output? */
1248
#if defined (__GNUC__) and defined (__GLIBC__)
1249
#if not __GLIBC_PREREQ(2, 16)
1250
#pragma GCC diagnostic push
1251
#pragma GCC diagnostic ignored "-Wsign-conversion"
1252
#endif
1253
#endif
1254
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){ /* Spurious
1255
warning from
1256
-Wconversion
1257
in GNU libc
1258
before
1259
2.16 */
1260
#if defined (__GNUC__) and defined (__GLIBC__)
1261
#if not __GLIBC_PREREQ(2, 16)
1262
#pragma GCC diagnostic pop
1263
#endif
1264
#endif
1028
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1265
1029
/* This process had nothing to say at this time */
1266
1030
proc = proc->next;
1267
1031
continue;
1268
1032
}
1269
1033
/* Before reading, make the process' data buffer large enough */
1270
1034
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
1271
char *new_buffer = realloc(proc->buffer, proc->buffer_size
1272
+ (size_t) BUFFER_SIZE);
1273
if(new_buffer == NULL){
1274
error(0, errno, "malloc");
1275
exitstatus = EX_OSERR;
1035
proc->buffer = realloc(proc->buffer, proc->buffer_size
1036
+ (size_t) BUFFER_SIZE);
1037
if(proc->buffer == NULL){
1038
perror("malloc");
1039
exitstatus = EXIT_FAILURE;
1276
1040
goto fallback;
1277
1041
}
1278
proc->buffer = new_buffer;
1279
1042
proc->buffer_size += BUFFER_SIZE;
1280
1043
}
1281
1044
/* Read from the process */
1282
sret = TEMP_FAILURE_RETRY(read(proc->fd,
1283
proc->buffer
1284
+ proc->buffer_length,
1285
BUFFER_SIZE));
1045
sret = read(proc->fd, proc->buffer + proc->buffer_length,
1046
BUFFER_SIZE);
1286
1047
if(sret < 0){
1287
1048
/* Read error from this process; ignore the error */
1288
1049
proc = proc->next;
1300
1061
1301
1062
fallback:
1302
1063
1303
if(plugin_list == NULL or (exitstatus != EXIT_SUCCESS
1304
and exitstatus != EX_OK)){
1064
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1305
1065
/* Fallback if all plugins failed, none are found or an error
1306
1066
occured */
1307
1067
bool bret;
1315
1075
}
1316
1076
bret = print_out_password(passwordbuffer, len);
1317
1077
if(not bret){
1318
error(0, errno, "print_out_password");
1319
exitstatus = EX_IOERR;
1078
perror("print_out_password");
1079
exitstatus = EXIT_FAILURE;
1320
1080
}
1321
1081
}
1322
1082
1323
1083
/* Restore old signal handler */
1324
1084
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1325
1085
if(ret == -1){
1326
error(0, errno, "sigaction");
1327
exitstatus = EX_OSERR;
1086
perror("sigaction");
1087
exitstatus = EXIT_FAILURE;
1328
1088
}
1329
1089
1330
1090
if(custom_argv != NULL){
1345
1105
ret = kill(p->pid, SIGTERM);
1346
1106
if(ret == -1 and errno != ESRCH){
1347
1107
/* Set-uid proccesses might not get closed */
1348
error(0, errno, "kill");
1108
perror("kill");
1349
1109
}
1350
1110
}
1351
1111
}
1352
1112
1353
1113
/* Wait for any remaining child processes to terminate */
1354
do {
1114
do{
1355
1115
ret = wait(NULL);
1356
1116
} while(ret >= 0);
1357
1117
if(errno != ECHILD){
1358
error(0, errno, "wait");
1118
perror("wait");
1359
1119
}
1360
1120
1361
1121
free_plugin_list();
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0